<template>
  <div class="xtx-numbox">
    <div class="label" v-if="isShow">数量</div>
    <div class="numbox">
      <a href="javascript:;" @click="descFn">-</a>
      <input type="text" readonly :value="num" />
      <a href="javascript:;" @click="addFn">+</a>
    </div>
  </div>
</template>
<script>
import { ref, watch } from 'vue'
export default {
  name: 'XtxNumbox',
  props: {
    goodsNum: {
      type: Number
    },
    max: {
      type: Number
    },
    min: {
      type: Number
    },
    isShow: {
      type: Boolean,
      default: true
    }
  },
  // emits: ['update:modelValue'],
  setup (props, { emit }) {
    // 商品数量
    const num = ref(0)
    watch(() => props.value, () => {
      num.value = props.goodsNum
    }, {
      immediate: true
    })

    // 增加商品数量
    function addFn () {
      // 超过最大值不执行++
      if (num.value === props.max) {
        return
      }

      num.value++
      // emit('update:modelValue', num.value)
      emit('updateNum', num.value)
    }
    // 减少商品数量
    function descFn () {
      // 超过最小值不执行--
      if (num.value === props.min) {
        return
      }

      num.value--
      // emit('update:modelValue', num.value)
      emit('updateNum', num.value)
    }

    return {
      addFn,
      descFn,
      num
    }
  }

}
</script>
<style scoped lang="less">
.xtx-numbox {
  display: flex;
  align-items: center;
  .label {
    width: 60px;
    color: #999;
    padding-left: 10px;
  }
  .numbox {
    width: 120px;
    height: 30px;
    border: 1px solid #e4e4e4;
    display: flex;
    > a {
      width: 29px;
      line-height: 28px;
      text-align: center;
      background: #f8f8f8;
      font-size: 16px;
      color: #666;
      &:first-of-type {
        border-right: 1px solid #e4e4e4;
      }
      &:last-of-type {
        border-left: 1px solid #e4e4e4;
      }
    }
    > input {
      width: 60px;
      padding: 0 5px;
      text-align: center;
      color: #666;
    }
  }
}
</style>
